Multivariate modulation and coding for wireless communication

摘要

This paper explores the improvement in information capacity andnpractical data rate that is possible with adaptive antenna technologynapplied to wireless-multipath communication channels. Whereas thenconventional view is that multipath-signal propagation is an impedimentnto reliable communication, this paper shows that multipath can actuallynmultiply the achievable data rate for wireless channels provided thatnthe appropriate communication structure is employed. Multivariatendiscrete multitone (MDMT) combined with multivariate trellis-codednmodulation (MTCM) is proposed and analyzed as a practical means ofnrealizing a multiplicative-rate advantage in the case wherenchannel-state information is not available at the transmitter. InnRayleigh fading, these new techniques are shown to simultaneouslynachieve a multiplicative data-rate advantage and lower error rate asncompared to conventional coded orthogonal-frequency divisionnmultiplexing. Optimal minimum mean square error (MMSE), adaptive MDMTnchannel-estimation techniques are derived. The effects ofnchannel-estimation error on MTCM are analyzed